Classifications

• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
  • C09K3/00—Materials not provided for elsewhere
  • C09K3/18—Materials not provided for elsewhere for application to surfaces to minimize adherence of ice, mist or water thereto; Thawing or antifreeze materials for application to surfaces
  • C09K3/185—Thawing materials
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B64—AIRCRAFT; AVIATION; COSMONAUTICS
  • B64F—GROUND OR AIRCRAFT-CARRIER-DECK INSTALLATIONS SPECIALLY ADAPTED FOR USE IN CONNECTION WITH AIRCRAFT; DESIGNING, MANUFACTURING, ASSEMBLING, CLEANING, MAINTAINING OR REPAIRING AIRCRAFT, NOT OTHERWISE PROVIDED FOR; HANDLING, TRANSPORTING, TESTING OR INSPECTING AIRCRAFT COMPONENTS, NOT OTHERWISE PROVIDED FOR
  • B64F5/00—Designing, manufacturing, assembling, cleaning, maintaining or repairing aircraft, not otherwise provided for; Handling, transporting, testing or inspecting aircraft components, not otherwise provided for
  • B64F5/20—Ground installations for de-icing aircraft
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B64—AIRCRAFT; AVIATION; COSMONAUTICS
  • B64F—GROUND OR AIRCRAFT-CARRIER-DECK INSTALLATIONS SPECIALLY ADAPTED FOR USE IN CONNECTION WITH AIRCRAFT; DESIGNING, MANUFACTURING, ASSEMBLING, CLEANING, MAINTAINING OR REPAIRING AIRCRAFT, NOT OTHERWISE PROVIDED FOR; HANDLING, TRANSPORTING, TESTING OR INSPECTING AIRCRAFT COMPONENTS, NOT OTHERWISE PROVIDED FOR
  • B64F5/00—Designing, manufacturing, assembling, cleaning, maintaining or repairing aircraft, not otherwise provided for; Handling, transporting, testing or inspecting aircraft components, not otherwise provided for
  • B64F5/20—Ground installations for de-icing aircraft
  • B64F5/23—Ground installations for de-icing aircraft by liquid application; Spraying installations therefor, e.g. fitted on vehicles
• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
  • C09K3/00—Materials not provided for elsewhere
  • C09K3/18—Materials not provided for elsewhere for application to surfaces to minimize adherence of ice, mist or water thereto; Thawing or antifreeze materials for application to surfaces
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
  • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
  • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
  • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

Definitions

• the present invention concerns aircraft deicing or antiicing compositions based on glycols and water.
• Aircraft deicing compositions are applied to aircraft in wintery weather before takeoff to deice them or to prevent ice forming on them for a certain period (the so-called hold-over time). This goal is frequently achieved with compositions which in addition to a glycol and water contain thickeners which increase the viscosity of the fluid and thus prevent rapid runoff of the fluid off the aircraft.
• the thickeners are for example cross-linked, high molecular weight polyacrylic acids.
• the composition of such thickener-containing deicing fluids is known for example from DE-A-3 832 310. Such fluids can give long hold-over times.
• the ISO standard 11075 describes the technical requirements of unthickened aircraft deicing fluids having a glycol content of above 80% by weight, which in use are diluted to a water content from 25 to 50% by weight.
• the disadvantage of such fluids as conform for example to U.S. Airforce specification MIL A-8243 D is their short hold-over time, which in practice frequently necessitates repeated deicing of an aircraft when takeoff is delayed by a few minutes.
• working up such deicing fluids and reusing the glycol component is technically relatively straight forward.
• thickener-free aircraft deicing or antiicing compositions based on glycols and water consisting essentially of:
• the weight percentages are always based on the total weight of the composition, the amount of water always being used to make up to 100%.
• compositions of the invention are used in the compositions of the invention:
• This component is preferably propylene glycol or diethylene glycol.
• Component a) is preferably used in amounts from 85 to 90% by weight.
• This surfactant component preferably comprises C 13 -C 15 oxo alcohols which have been alkoxylated with from 1 to 10 equivalents of ethylene oxide, preferably with 3 to 5 molecules.
• surfactants based on lauryl alcohol, myristyl alcohol, palmityl alcohol and stearyl alcohol and also tallow fat alcohols. It is also possible to use mixtures of the surfactants mentioned.
• the surfactants are commercially obtainable or preparable by known methods, for example by reacting the alcohols mentioned with from 1 to 10 equivalents of ethylene oxide or propylene oxide.
• the preferred amount of surfactant is from 0.1 to 0.5% by weight.
• the polymeric carboxylic acid is preferably a polyacrylate which may contain up to 15% by weight, based on the polymer, of comonomers such as maleic anhydride and itaconic acid.
• the preferred amount of this polymer is from 0.2 to 0.5% by weight.
• Ammonia and hydroxyalkylamines such as monoethanolamine, diethanolamine and triethanolamide are preferably used in the compositions of the invention in amounts from 0.1 to 0.5% by weight.
• compositions of the invention contain a surfactant different from component b) in amounts from 0.05 to 1.0% by weight, particularly preferably from 0.1 to 0.4% by weight.
• a surfactant different from component b) in amounts from 0.05 to 1.0% by weight, particularly preferably from 0.1 to 0.4% by weight.
• alcohols having fewer than 6 oxyalkylene groups are used as component b), it is advantageous to include a further surfactant in the compositions.
• Suitable surfactants are anionic surfactants such as alkali metal salts of alkylarylsulfonates, e.g. sodium dodecylbenzenesulfonate, and fatty alcohol (ether) sulfates, but also cationic surfactants.
• a typical anionic surfactant also includes C 12 -C 14 fatty alcohol (lauryl alcohol) reacted with 2 mol of ethylene oxide and then sulfated and neutralized with sodium hydroxide solution.
• nonionic surfactants such as surfactants from C 13 -C 15 alcohols which have been alkoxylated with from 11 to 20 molecules of ethylene oxide, also fatty acid amides and zwitterionic compounds such as glycine derivatives.
• Particular preference is given to N-methyl-N-oleoylglycine (also known as N-oleoylsarcosine or Medialan acid).
• Component f) comprises corrosion inhibitors of the type customary for fluids based on a glycol and water. Examples include sodium nitrate, the potassium or sodium salt of sebacic acid, benzotriazole and tolutriazole.
• This component is preferably fully demineralized water.
• the deicing compositions are prepared by mixing the components in a stirred vessel in any desired order. It is advantageous to introduce the components b) to f) into the glycol a) and then to add the water g).
• the unthickened deicing compositions of the invention give long hold-over times which are distinctly longer than the minimum time of 3 minutes required of such mixtures by the ISO standard. Lengthening the hold-over time increases the safety reserves in those cases in which there has been a short delay in the takeoff of the aircraft. Moreover, the compositions of the invention have a low surface tension, reducing the loss of lift during takeoff.
• This deicing fluid was prepared in accordance with the U.S. Airforce specification MIL A-82 43 D.
• the deicing or antiicing fluids of the invention give hold-over times which are distinctly longer than the hold-over times of the comparative examples. Furthermore, the surface tension of the compositions according to the invention is lower than that of the comparative compositions.

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• Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Manufacturing & Machinery (AREA)
• Transportation (AREA)
• Aviation & Aerospace Engineering (AREA)
• Combustion & Propulsion (AREA)
• Materials Engineering (AREA)
• Organic Chemistry (AREA)
• Materials Applied To Surfaces To Minimize Adherence Of Mist Or Water (AREA)
• Compositions Of Macromolecular Compounds (AREA)
• Detergent Compositions (AREA)
• Anti-Oxidant Or Stabilizer Compositions (AREA)

Applications Claiming Priority (3)

Publications (1)

Family

ID=6495206

Family Applications (1)

Country Status (8)

Cited By (17)

Citations (13)

Family Cites Families (1)

• 1993
  • 1993-08-14 DE DE4327360A patent/DE4327360A1/de not_active Withdrawn
• 1994
  • 1994-07-28 AT AT94926125T patent/ATE162847T1/de not_active IP Right Cessation
  • 1994-07-28 FI FI960649A patent/FI960649A7/fi unknown
  • 1994-07-28 EP EP94926125A patent/EP0713514B1/de not_active Expired - Lifetime
  • 1994-07-28 WO PCT/EP1994/002489 patent/WO1995005428A1/de not_active Ceased
  • 1994-07-28 DK DK94926125.9T patent/DK0713514T3/da active
  • 1994-07-28 US US08/591,564 patent/US5759436A/en not_active Expired - Fee Related
  • 1994-07-28 DE DE59405188T patent/DE59405188D1/de not_active Expired - Fee Related
• 1996
  • 1996-02-13 NO NO960568A patent/NO960568D0/no not_active Application Discontinuation

Patent Citations (14)

Non-Patent Citations (2)

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